The Amaranto are at the bottom of the Serie A with just 19 points from 27 games played.
“Reggina’s league position is not the best one,” Cirillo told Radio Kiss Kiss.
“On Sunday we cannot make mistakes, as against Napoli we play at the Granillo stadium and we are forced to win, even though the Azzurri are not going through a good period.
“We fear their reaction: they have not won for the past nine games and they will want to redeem themselves.
“We are aware that we will be facing a quality group, with important players who will come to Calabria to achieve a positive result. We will do everything we can to win the three points.”